You’d think it would interfere, but that’s the cool thing about Speed-IF: in most, the idea is it’s not expected to be perfect, it’s just an exercise you can play with for a couple hours or longer and present if you have the time. Like how Ectocomp forces a strict time limit but you don’t have to do it all at once, chess-clock style.
I remember the year we did Cragne Manor and only had to do one room, it was right before IFComp. (I say right before but in reality like 3-4 months? That’s fast to code and test Inform 7 but we also had the inhumanly capable support of Jenni and Ryan.) We were told it could be as simple as it needed to be so long as it met parameters. I grumbled because I had an IFComp entry to finish and swore I’d just implement some menacing wallpaper and be done. But they fed me an awesome locale and of course I dropped everything and ended up producing a room that is probably in the top ten for highest word-count. How long did we have for that? Like two months total? Right before IFComp*.
Low expectations, low commitment, fabulous opportunity for inspiration. Especially if you’re working on something else and already warmed-up, it’s an amazing palate-cleanser/powerup.
*As I remember, the deadlines were before IFComp, but Cragne wasn’t released until December during IFComp since they had to wrestle 80+ multi-tentacled separate games together into one enormous thing.